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Microdryas iravadioides (Gatliff & Gabriel, 1913)

Description: Shell minute, elongate, spire convex in outline. Protoconch paucispiral, rounded, with spiral rows of minute pits, and distinct junction with teleoconch. Teleoconch up to 4 whorls, weakly rounded, with 5 spiral cords on second-last whorl; last whorl expanded, with further 5 spirals on base. No axial sculpture. Aperture ovate, almost D-shaped, with no anterior or posterior canals. Inner lip separated from last whorl by extremely narrow groove. Outer lip with weak varix externally, smooth internally. Umbilicus closed. Colour white.

Size: Up to 1.6 mm in length.

Distribution: Endemic to Australia: Port Stephens, NSW, southwards to eastern Tasmania.

Habitat: Most NSW specimens are from beach washup, with a few others down to 20 m. Type specimens are from Tasmania in 40 fathoms (93 m). Rare.

Synonymy: Laseron (1950) misidentified and figured this species as Cingula australiae Frauenfeld, 1867.

Fig. 1: Fingal Bay, Port Stephens, NSW. (Shell surface eroded on last whorl). (C.351973)

Fig. 2: Original type figure from Gatliff & Gabriel, 1913


Copyright Des Beechey 2010